No. Not until I unlocked them from the Gear Shop about an hour ago. Then I noticed I could float any of them. I wasn't sure if that was because I had just spent the 10,000 medals to unlock Airborne turrets in the Gear Shop; or if that option was always there, and I didn't notice it.

I was expecting to be able to only make one turret airborne, because a lot of tech in the gear shop seems to only apply to one unit; so I was pleasantly surprised when I saw I could make them all airborne.

No. Not until I unlocked them from the Gear Shop about an hour ago. Then I noticed I could float any of them. I wasn't sure if that was because I spent 10,000 medals on it in the Gear Shop; or if that option was always there, and I didn't notice it.